In this paper, a porous material (ZSM-5 molecular sieves) with remarkable structure is select to apply for berberine adsorption from the extracts of the Cortex Phellodendron. The batch experiments show that the optimum adsorbent dosage was 2.0 g and pH 8 is favorable for the berberine adsorption. The adsorption of berberine by ZSM-5 molecular sieve is more in consistence with the pseudo-second-order kinetic model and chemical adsorption plays a major role. There exist three diffusion stages during the adsorption of berberine, indicating that intraparticle diffusion is not the only rate-controlling step. Isothermal adsorption data is more in consistence with the Langmuir model, indicating that adsorption occurs at the monolayer interface. Thermodynamic results show that the adsorption is a spontaneous and exothermic process with entropy decrease. Under the conditions of pH 2 and concentration of eluents of 80%, the elution rate is 98.73%. The purity of berberine increased from 31.4 to 73.1%. After repeating adsorption for 15 times, the adsorption capacity of ZSM-5 molecular sieve for berberine remains well, which indicates that ZSM-5 has great purification capacity and reusability. These results confirm that ZSM-5 has potential superior properties for the purification and isolation of active ingredients from medicinal herbs.

中文翻译：

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皮质黄柏ZSM-5分子筛对小ber碱的吸附动力学和等温线

本文选择具有显着结构的多孔材料（ZSM-5分子筛）从黄柏提取物中进行黄连素的吸附。。分批实验表明，最佳吸附剂用量为2.0 g，pH 8有利于小ber碱的吸附。ZSM-5分子筛对小ber碱的吸附更符合拟二级动力学模型，化学吸附起主要作用。小ber碱的吸附过程中存在三个扩散阶段，表明颗粒内扩散不是唯一的速率控制步骤。等温吸附数据更符合Langmuir模型，表明吸附发生在单层界面。热力学结果表明，吸附是一个自发的，放热的过程，熵降低。在pH 2和洗脱液浓度为80％的条件下，洗脱率为98.73％。小ber碱的纯度从31.4％增加到73.1％。重复吸附15次后，ZSM-5分子筛对小ber碱的吸附能力保持良好，这表明ZSM-5具有很好的提纯能力和可重复使用性。这些结果证实，ZSM-5具有潜在的优异性能，可用于从草药中纯化和分离活性成分。